OBSERVATION OF NEWTONIAN RINGS ON PVA POLYMER DURING HF LASER-INDUCED PHYSICAL MODIFICATION USING AN OPTICAL FIBRE

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KHOSROSHAHI M.E.

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Journal: Iranian Polymer Journal Year:2002 | Volume:11 | Issue:2 Page(s): 93-98

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Title

OBSERVATION OF NEWTONIAN RINGS ON PVA POLYMER DURING HF LASER-INDUCED PHYSICAL MODIFICATION USING AN OPTICAL FIBRE

Author(s)

KHOSROSHAHI M.E. | Issue Writer Certificate

Keywords

HF LASER

PVA POLYMER

OPTICAL FIBRE

SURFACE MODIFICATION

NEWTONIAN RINGS

Abstract

The ablation of polyvinyl alcohol (PVA) with a multi-line 2.6-3.0 mum HF LASER showed a strong interaction due to its relatively high absorption coefficient 7x104 cm-1, particularly hydrogen bands at 3597 cm-1. By using the expression for heat diffusion limit, surface temperature (Ts) of 340 K and 449 K were calculated for fluences of 0.3 and 1 Jcm-2, respectively. The Ts values are well consistent with the PVA melting point of 531 K and SEM photographs. With the average activation energy of 188 KJ mol-1 and rate constant of 6x107 s-1, a value of approximate to6x10-6 s-1 for Tapproximate to(146-230) K is obtained. The thermal degradation effect in short pulse duration was evident by NEWTONIAN RINGS which basically is an interference pattern created by light, reflects off the boiling ablated material and the underneath solid material.

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APA: Copy

KHOSROSHAHI, M.E.. (2002). OBSERVATION OF NEWTONIAN RINGS ON PVA POLYMER DURING HF LASER-INDUCED PHYSICAL MODIFICATION USING AN OPTICAL FIBRE . IRANIAN POLYMER JOURNAL (ENGLISH), 11(2), 93-98. SID. https://sid.ir/paper/539891/en

Vancouver: Copy

KHOSROSHAHI M.E.. OBSERVATION OF NEWTONIAN RINGS ON PVA POLYMER DURING HF LASER-INDUCED PHYSICAL MODIFICATION USING AN OPTICAL FIBRE . IRANIAN POLYMER JOURNAL (ENGLISH)[Internet]. 2002;11(2):93-98. Available from: https://sid.ir/paper/539891/en

IEEE: Copy

M.E. KHOSROSHAHI, “OBSERVATION OF NEWTONIAN RINGS ON PVA POLYMER DURING HF LASER-INDUCED PHYSICAL MODIFICATION USING AN OPTICAL FIBRE ,” IRANIAN POLYMER JOURNAL (ENGLISH), vol. 11, no. 2, pp. 93–98, 2002, [Online]. Available: https://sid.ir/paper/539891/en

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